Grinding composition for sharpening shredder blades, grinding sheet and grinding product manufactured, and related manufacturing process

ABSTRACT

A grinding composition for sharpening shredder blades of a shredder includes, based on total weight of the grinding composition, from 51 to 65 wt % of a grinding powder; from 5 to 35 wt % of a viscous grease agent; and from 3 to 30 wt % of at least one functional additive. A grinding sheet formed from the composition is used as a grinding product alone or in a bag. The composition is sealed in a bag and used as a grinding product. A process for manufacturing the latter grinding product employs an automatic form-fill-seal packaging machine. The shredder blades of a paper shredder are sharpened satisfactorily by the grinding composition as the grinding sheet or grinding product is shredded. The useful life of shredders is cost effectively extended while providing convenience in use that saves time and labor.

CROSS-REFERENCE TO RELATED APPLICATION

This non-provisional Application claims the benefit of the priority ofApplicant's earlier filed Chinese Patent Application No. 200910056439.5filed Aug. 14, 2009, the entire contents of which are incorporatedherein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to the field of shredders, especially tothe field of shredder maintenance, and in particular to a grindingcomposition for sharpening shredder blades, manufactured into a grindingsheet or packaged in a bag as a grinding product, and to a relatedmanufacturing process.

2. Background of the Related Art

The main component of existing shredders is a shredder core which hastwo shredder blade groups inside. When paper is shredded these twoshredder blade groups rotate relative to each other to shred paper thatenters into a position between them through the cooperation of theshredder blades of the two shredder blade groups. However, as use timeincreases, shredder blades become progressively duller, which greatlyreduces the effectiveness of the shredder and easily leads to mechanicalfailure such as paper jams, and finally to blade damage and evenbreakdown of the machine, thereby effecting the normal work.

The conventional method to address the above-mentioned problem is todisassemble the shredder, dismount the blades of the shredder bladegroups, grind the blades to make them sharp again, and reassemble them,so that this method is time-consuming and laborious. Another method isto replace the shredder blade groups directly which, although fasterthan the first method, has an increased maintenance cost and theshredder must also be disassembled, so that it is still relativelytroublesome.

Objects of the present invention generally pertain to providing: agrinding composition for sharpening shredder blades, a grinding sheetand grinding products, and a related manufacturing process. The grindingcomposition for sharpening shredder blades should be easy and convenientto prepare, and its raw materials easy to obtain. The grinding sheet andgrinding products to be manufactured from the grinding composition havesimple structures and are useful to grind shredder blades to sharpenthem satisfactorily, while being convenient to use. The grinding sheetand grinding products should be time-saving and labor-saving, extend theuseful life of shredders, reduce the cost of use, and therefore besuitable for popularization and application on a large-scale.

SUMMARY OF THE INVENTION

In order to realize the above aims, in a first aspect of the invention,a grinding composition for sharpening shredder blades is provided. In anaspect, the grinding composition for sharpening shredder blades,comprises, based on total weight of the grinding composition, from 51 to65 wt % of a grinding powder, from 5 to 35 wt % of a viscous greaseagent, and from 3 to 30 wt % of at least one functional additive.

Further in this aspect, the viscous grease agent includes at least oneof white oil, animal oil, vegetable oil and stearin candle, and the atleast one functional additive includes at least one of an anti-rustpowder, an anti-wear powder, an anti-static powder and an anti-oxidationpowder.

Additionally in this aspect, the grinding composition comprises one of:(a) 55 wt % of the grinding powder, 5 wt % of the anti-rust powder, 2 wt% of the anti-wear powder, 35 wt % of the white oil and the vegetableoil combined, 2 wt % of the anti-static powder, and 1 wt % of theanti-oxidation powder, or (b) 57 wt % of the grinding powder, 5 wt % ofthe anti-rust powder, 35 wt % of the stearin candle, 2 wt % of theanti-static powder, and 1 wt % of the anti-oxidation powder.

Additionally in this aspect, the stearin candle is prepared by combiningstearic acid made from animal or plant fats with white wax,microcrystalline wax and polyethylene wax (PE wax). The grinding powderis a natural mineral grinding powder, the anti-rust powder is aluminumdistearate, the anti-wear powder is microcrystalline wax or complexsodium-calcium soap grease, the anti-static powder is glycerolmonostearate and the anti-oxidation powder is butylated hydroxytoluene.

Additionally in this aspect, the natural mineral grinding powder is anatural diamond grinding powder or a natural micron quartz grindingpowder. The mesh number of the quartz grinding powder is preferably 260mesh, and its hardness is 7, so that it is suitable for grinding metalor the like.

The grinding powder functions to grind the shredder blades to maintainthe sharpness of the shredder blades, as well as removing rusty spots,paper scraps, blemishes, etc. from the surface of shredder blades.

The viscous grease agent may be white wax oil used in cosmetics, babyoil or animal oil or vegetable oil or stearin candle, that is suitablefor body contact with people and is naturally biologically degradable.It functions (1) to make the complex sodium-calcium soap grease and (2)as a sticky powder to prevent the grinding powder, the anti-rust powder,the anti-static powder and the anti-oxidation powder from spraying andflying.

The anti-static powder functions to prevent the shredder blades fromrusting, and can coat anti-rust protective films on shredder blades toprevent them from future rusting. Its role is to form a firm adsorptionfilm on the surface of metal, to prevent oxygen and water, particularlywater, from contacting the surface of the metal, and to prevent themetal from rusting. Normally, the adsorption forces of the mineral oil,the vegetable oil and the metal are not strong (e.g., the energy of thesurface free radicals of the metal is on the order of tenths of oneN/m). The surface tension of water is 8×10⁻⁴ N/cm and the surfacetension of hydrocarbon is 2×10⁻⁴ N/cm˜3×10⁻⁴ N/cm, so that the oil filmformed on the metal is not firm. It is easy to absorb and dissolve partof the water and oxygen, and easy to permeate the oil film. Thereforethe anti-rust membrane role played is very weak. If anti-rust powder isadded, these shortcomings can be compensated for.

The anti-static powder functions to eliminate static, to prevent paperscraps and sundries from adhering to shredder blades, and even toprevent the dust explosion of the paper in the shredder closed chamberdue to the electric sparks produced by the motor or the static. Theanti-static powder prevents paper scraps and powders from adhering toshredder blades, which can lower the paper shredding function of theshredder blades. The anti-static powder is a chemical additive that canprevent the generation of the electrostatic charge or dissipateelectrostatic charge effectively. The manner of using anti-static powderis by spreading it on the surfaces of the products or by adding itinside the products. Thus, the anti-static powder can eliminate theelectrostatic induction generated by the operation of the shredderblades to eliminate the phenomenon of electric sparks.

The anti-oxidation powder functions to prevent the metal of shredderblades from oxidizing and rusting. Combined with an anti-rust agent, ithas a dual effect and can prevent the oxidative rancidity of the viscousgrease agent, the stearin candle. The principle role of ananti-oxidation powder is to prevent or delay metal oxidation but, theanti-oxidation powder must be added before the oxidative deterioration,since it cannot recover after the occurrence of an oxidation reaction.

The anti-wear powder functions to prevent the surface of the metal ofshredder blades from wearing and becoming scratched, and to reducevibration noise.

The wear-resistant forming agent (e.g., microcrystalline wax or complexsodium-calcium soap grease) functions to adhere on metal surfaces withgood adhesion properties. Combined with micron quartz powder, it canform firm protective films on blades to extend the blade life. Themicron quartz powder generally exceeds 120 mesh.

In a second aspect of the invention, a grinding sheet for sharpeningshredder blades is provided. The grinding sheet comprises a sheet madeof the grinding composition, which has been stirred, melted and mixed,and cooled and pressed into sheet form, wherein the viscous grease agentincludes stearin candle so that the sheet is a solid wax sheet. Agrinding product for sharpening shredder blades may comprise thegrinding sheet.

In a third aspect of the present invention, a grinding product forsharpening shredder blades is provided. The product comprises a sealedbag and the above-mentioned grinding composition for sharpening shredderblades positioned inside the sealed bag.

In this aspect, the sealed bag is made of plastic.Further in this aspect, the sealed plastic bag is made of polypropylene.

In a fourth aspect of the invention, a process for manufacturing theabove-mentioned grinding product for sharpening shredder blades isprovided. The method includes moving and placing a roll of laminatedplastic film on an automatic form-fill-seal packaging machine, andsending a measured amount of the grinding composition into a feed chuteof the automatic form-fill-seal packaging machine, each measured amountis determined by a fill amount of the grinding composition needed inview of dimensions of the plastic sealed bag including length and widththereof. The measured amount of the grinding composition is filledthrough the automatic form-fill-seal packaging machine to provide afilled plastic bag. The filled plastic bag is sealed to provide thegrinding product.

In this aspect, the plastic film is a polypropylene plastic film. Themain component of the OPP/CPP plastic film material (e.g. OPP/CPPplastic bags) is polypropylene plastic. It can be renewed and reusedrepeatedly, and be burnt completely without affecting the useful life ofan incinerator, and without producing toxic gases, so that secondaryenvironmental pollution is avoided. Therefore, it complies with therequirements of modern environmental protection.

This aspect may further includes pre-printing on the plastic film atleast one of (a) overprinted text that is monochromatic or multicoloroverprinted text and (b) pictures.

The beneficial effects of the invention includes the following:

-   (1) The grinding composition for sharpening shredder blades of the    invention, comprising the grinding powder, the anti-rust powder, the    anti-wear powder, the anti-static powder, the anti-oxidation powder    and the viscous agent or stearin candle, is simple and convenient to    prepare, the raw materials being easy to obtain. The grinding    composition can grind shredder blades and has enhanced functions    including anti-rust, anti-static, anti-oxidation, etc., extends the    service life of paper shredders, reduces the operating cost, and is    suitable for popularization and application on a large-scale.-   (2) The invention places the grinding composition for sharpening    shredder blades inside a sealed bag. If the grinding composition for    sharpening shredder blades can be made to be a solid wax sheet,    i.e., a grinding sheet, the bag can be unsealed. Thus, when grinding    of shredder blades is needed to regain sharpness, it is not    necessary to disassemble the shredder. Rather, the grinding sheet or    grinding product, is just inserted directly into the paper inlet as    in the process of shredding paper. When the shredder blades cut the    grinding product for sharpening shredder blades, for example, the    sealed bag is cut open, the grinding powder of the grinding    composition inside grinds the shredder blades to make them sharp.    Therefore, the grinding sheet and grinding product have simple    structures and can grind shredder blades satisfactorily, while being    convenient to use, time-saving and labor-saving. They extend the    life of the shredders, reduce the operational cost, and are suitable    for popularization and application on a large-scale.-   (3) The grinding composition for sharpening shredder blades of the    invention further comprises trace amounts of functional additives,    such as the anti-rust agent, the anti-static powder, the    anti-oxidant powder and so on, that can enhance the functions of    anti-rust, anti-static, anti-oxidation, etc., so as to further    extend the service life of paper shredders and reduce the cost of    use.-   (4) The grinding sheet and packaged grinding product for sharpening    shredder blades of the invention will not pollute a pile of paper    scraps and a paper ash-bin, are related shredder products which save    energy and are environment-friendly, and can grind shredder blades    reliably so as to extend the service life of shredders.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of the three-dimensional structure of oneembodiment of the grinding product for sharpening shredder blades of thepresent invention; and

FIG. 2 is a schematic exploded view of the embodiment shown in FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

FIGS. 1 and 2 show grinding product 10 including grinding composition 2,as grinding sheet 2, positioned in bag 1 between sheets 4 and 5. Bag 1is a transparent plastic bag as shown and may be sealed or unsealed.Grinding composition 2 may include functional additives 3.

Part I. The steps of the manufacturing process of the grinding productof the powders for sharpening shredder blades of the invention areapproximately as follows:

Working environment: room temperature is 20˜30° C., and relativehumidity is about 60˜70%.

1. Preparing the complex sodium-calcium soap grease with 20% animal oilor vegetable oil and alkali (such as sodium hydroxide, calciumhydroxide, calcium acetate, etc.).

A saponification reaction is an exothermic reaction, and is a relativelyslow chemical reaction. In order to optimize and accelerate the reactionrate in the chemical reaction process, relatively high temperatures,such as 75˜85° C., can be maintained, and the solution is stirredcontinuously, such as at 1,000˜1,200 r/min, to increase the number ofmolecules colliding.

The below table shows the saponification reference values calculated asthe amount of sodium hydroxide needed in the saponification of oil.

Saponification value (Sodium Hardness Value Kind of Oil hydroxide, NaOH)(INS Value) Olive Oil 0.134 109 Coconut Oil 0.190 258 Palm Oil 0.141 145Rice Bran Oil 0.128 70

The saponification reaction equation may be described as follows:

The chemical formula of triglyceride of is:

CH₂COOR—CHCOOR—CH₂—COOR→C₃H₅(OCOR)₃→RCOOR′.

According to an analysis of the chemical formula, it is obtained bythree fatty acid molecules (R—COOH) and one glycerol molecule(C₃H₅(OH)). Therefore, the saponification reaction equation is:

CH₂COOR—CHCOOR—CH₂—COOR+3NaOH

3R—COONa (sodium soap base)+CH₂OH—CHOH—CH₂OH (glycerol).

The R base may be different, but the R-COONa produced all can besaponified. The common R— includes:

C17H33-: 8-heptadecenyl group and the R-COOH is oleic acid;

C17H33-: n-pentadecyl group and the R-COOH is palmitic acid; and

C17H35-: n-heptadecyl group and the R-COOH.

Oleic acid is a monounsaturated fatty acid, and is obtained from thehydrolysis of oil; palmitic acid and stearic acid both are saturatedfatty acids and are obtained from the hydrolysis of fat.

The usage of the saponification function is as follows. The complexsodium-calcium soap grease has a role like that of an invisible sponge,to absorb a large amount of the grinding powder 2 and oil so as to gointo a semisolid state, and it is both water and temperature resistant.Its drop point is about 150° C., and the temperature range of its use is100˜130° C. Furthermore, the complex sodium-calcium soap grease has verygood wear resistance, has a polar adhesive attraction to metal, and canform a wear resistant film with the quartz powder. However, the more thesoap content, the harder the consistency. On the other hand, the lessthe soap content, the thinner the consistency. Therefore, if finishedproducts with different consistencies are desired, the consistencies canbe controlled by adjusting the soap content.

Combining the most optimized parameters mentioned above, thesaponification time can be shortened to 45 minutes, and the stirring iscontinued until the product is cooled to room temperature (a coolingsystem can be used to accelerate cooling).

2. Adding a lot of the viscous grease agent (the white oil, the animaloil or the vegetable oil), and the grinding powder 2 which are evenlydispersed in the complex calcium-based soap grease, creates a semi-solidgel body (Gel).

Step 1: the complex sodium-calcium soap grease is added to tank A, andstirred by a mixer at 100˜1,200 rpm and 80% of the viscous grease agent(the white oil, the animal oil or the vegetable oil) is added to tank B.

Step 2: firstly, the additive is added to the viscous grease agent intank B, and then the mixer starts stirring the two rapidly at3,000˜4,000 rpm until the additive is completely dissolved.

Step 3: the grinding powder 2 cannot be deliquesced and agglomerated,and should be removed with a sieve.

Step 4: the solution in tank B following Step 2 is added slowly to thecontent of tank A at a speed of 10% of the total oil per minute andstirred continuously. When the oil is completely dissolved into a pastegel, the grinding powder 2 is added and stirred continuously to form asemi-solid gel body (Gel).

Step 5: the semi-solid gel body (Gel) in tank A is fed helically intothe feed chute of the automatic form-fill-seal packaging machine, toobtain the finished products of the grinding product for sharpeningshredder blades.

Part II. The steps of the manufacturing process for the grinding productin the form of a grinding sheet of the invention, to be used forsharpening shredder blades, may be as follows:

With this manufacturing process, the grinding sheet for sharpeningshredder blades, according to the invention, can be obtained, and itsform of packaging can be a sealed package, as in the case if the powderform of the invention described above, and also as an unsealed package.Various environmental-friendly materials like paper, release liners,plastic film adhesive paper, powder agents and so on can be used betweenthe grinding sheets to separate them.

In a working environment, the room temperature is typically 20˜30° C.,and the relative humidity is about 60˜70%.

In the manufacturing process, the stearic acid is made from plant fat oranimal fat, and placed, together with the white wax, themicrocrystalline wax, and the PE wax, into a device with atemperature-adjustable, hot-kerosene recirculating, heater and asingle-tank bi-directional variable speed mixing barrel. The temperatureis set at 200° C. When the waxes in the tank are completely dissolved,the temperature is lowered to 150° C. The mixer then starts stirring at1,000˜1,200 rpm, and the additive 3 is added. When the additive iscompletely dissolved, the grinding powder 2 is added through a sieve,and then the stirring speed is increased to 2,000˜2,500 rpm. After 15minutes, the speed is lowered to 1,000˜1,200 rpm, and the temperature isfurther reduced to 120° C. The mixture is sent through an insulated airpressure transfer line to an ice water, recirculating cooling systemthat has a metal tank with a teflon surface, a cutting shear, and avariable speed motor transport unit. After cooling and cutting, thesolid wax sheets with desired length and width can be obtained, and thensent to a planar automatic bag-forming machine to be packaged or bothpackaged and sealed, as single-sheet type or multi-sheet type grindingsheets.

The bag-forming steps in the above mentioned manufacturing processes ofPart I and Part II include moving and placing a whole roll of laminatedplastic film on an automatic form-fill-seal packaging machine, andsending the grinding composition for sharpening shredder blades into thefeed chute of the automatic form-fill-seal packaging machine, afteradjusting both the amount of the grinding composition to fill the bagand the length and the width of the plastic packaging product. Also partof these processes are the steps of filling the bag with a certainamount of the grinding composition for sharpening shredder bladesthrough the automatic form-fill-seal packaging machine, and making thefinished products of the grinding product for sharpening shredderblades.

To understand the technical content of the invention more clearly, theinvention is further described by reference to the following exemplaryembodiments.

Example 1

The grinding powder 2 is 55 wt %, based on total weight of thecomposition hereinafter. The anti-rust powder is 5 wt %, the anti-wearpowder is 2 wt %, the white oil is 35 wt %, the anti-static powder is 2wt % and the anti-oxidation powder is 1 wt %. The grinding powder 2, isnatural diamond grinding powder, the anti-rust powder is aluminumdistearate, the anti-static powder is glycerol monostearate, theanti-oxidation powder is butylated hydroxytoluene, the anti-wear powderis the complex sodium-calcium soap grease, and the manufacturingprocesses are described above in Part I.

Example 2

The grinding powder 2 is 57 wt %, the anti-rust powder is 5 wt %, thestearin candle is 35 wt %, the anti-static powder is 2 wt % and theanti-oxidation powder is 1 wt % The grinding powder 2, is naturaldiamond grinding powder, the anti-rust powder is aluminum distearate,the anti-static powder is glycerol monostearate, the anti-oxidationpowder is butylated hydroxytoluene, the anti-wear powder is the complexsodium-calcium soap grease, and the manufacturing processes describedabove in Part II.

Example 3

The grinding powder 2 is 51 wt %, the anti-rust powder is 15 wt %, theanti-wear powder is 6 wt %, the vegetable oil is 20 wt %, theanti-static powder is 6 wt % and the anti-oxidation powder is 2 wt % Thegrinding powder 2, is natural quartz grinding powder, the anti-rustpowder is aluminum distearate, the anti-static powder is glycerolmonostearate, the anti-oxidation powder is butylated hydroxytoluene, theanti-wear powder is the complex sodium-calcium soap grease, and themanufacturing processes are described above in Part I.

Example 4

The grinding powder 2 is 65 wt %, the anti-rust powder is 15 wt %, theanti-wear powder is 6 wt %, the white oil is 5 wt %, the anti-staticpowder is 6 wt % and the anti-oxidation powder is 3 wt %. The grindingpowder 2, is natural quartz grinding powder, the anti-rust powder isaluminum distearate, the anti-static powder is glycerol monostearate,the anti-oxidation powder is butylated hydroxytoluene, the anti-wearpowder is the complex sodium-calcium soap grease, and the manufacturingprocesses are described above in Part I.

Example 5

The grinding powder 2 is 64 wt %, the anti-rust powder is 1 wt %, thestearin candle is 33 wt %, the anti-static powder is 1 wt % and theanti-oxidation powder is 1 wt %. The grinding powder 2, is naturaldiamond grinding powder, the anti-rust powder is aluminum distearate,the anti-static powder is glycerol monostearate, the anti-oxidationpowder is butylated hydroxytoluene, the anti-wear powder is themicrocrystalline wax in the stearin candle, and the manufacturingprocesses are described above in Part II.

The grinding product for sharpening shredder blades of the invention isvery simple to use. To use it, the grinding product is inserted directlyinto the paper inlet of the shredder, just like in the process ofshredding paper. Therefore, it is very simple and convenient. When therotating blades in the shredder cut the grinding product for sharpeningshredder blades, the sealed bag 1 is cut open, due to the extrusionprinciple. The grinding powder 2 inside the bag will grind two sides ofeach of the high-speed rotating shredder blades to make them sharp, andwith the functional additive 3, it can coat the blades with anti-rustprotective films, and enhance the anti-oxidation and anti-staticfunctions of shredder blades. The grinding product can also maintain theshredders. After use, the grinding product will go into the ash-bin.

The grinding product of the invention, can grind shredder blades tomaintain the sharpness, and remove rusty spots, paper scraps, blemishes,etc. on the surface of the blades. The grinding product can preventpaper scraps and sundries from adhering to the blades, and prevent adust explosion of the paper in the shredder closed chamber due toelectric sparks produced by the motor or static. It can preventoxidizing and rusting of the blades. When combined with the anti-rustagent, the grinding product has a dual effect: it can prevent thesurface of the metal of shredder blades from wearing and scratching andreduce vibration noise, and it can form firm protective films on bladesto extend the blade life.

The invention can be used routinely and regularly to maintain theshredder blades of shredders, and can also be used according to thespecific conditions of the shredder blades, such as, when the papershredding is not very effective. Multiple grinding products forsharpening shredder blades can be used in one maintenance treatment.

The grinding composition for sharpening shredder blades of the inventionis easy and convenient to prepare and its raw materials are easy toobtain. The grinding sheet and grinding product manufactured from it,have simple structures, can grind shredder blades, are convenient touse, time-saving and labor-saving, and extend the operational life ofshredders, reduce their operational cost, and are suitable forpopularization and application on a large-scale.

While the invention has been shown and described with particularreference to preferred embodiments thereof, it is understood by thoseskilled in the art that various changes in form and details may be madetherein without departing from the spirit and scope of the invention asdefined by the claims. It is clearly understood therefore, that the samerepresents illustration and example only and is not to be taken as alimitation.

1. A grinding composition for sharpening shredder blades of a shredder,comprising, based on total weight of the grinding composition: from 51to 65 wt % of a grinding powder; from 5 to 35 wt % of a viscous greaseagent; and from 3 to 30 wt % of at least one functional additive.
 2. Thegrinding composition according to claim 1, wherein the viscous greaseagent includes at least one of white oil, animal oil, vegetable oil andstearin candle, and wherein the functional additive includes at leastone of an anti-rust powder, an anti-wear powder, an anti-static powderand an anti-oxidation powder.
 3. The grinding composition according toclaim 2, wherein the grinding composition comprises one of: (a) 55 wt %of the grinding powder, 5 wt % of the anti-rust powder, 2 wt % of theanti-wear powder, 35 wt % of the white oil and the vegetable oilcombined, 2 wt % of the anti-static powder, and 1 wt % of theanti-oxidation powder; or (b) 57 wt % of the grinding powder, 5 wt % ofthe anti-rust powder, 35 wt % of the stearin candle, 2 wt % of theanti-static powder, and 1 wt % of the anti-oxidation powder.
 4. Thegrinding composition according to claim 2, wherein the stearin candle isa combination of stearic acid that is made from animal or plant fatswith white wax, microcrystalline wax and polyethylene wax, wherein thegrinding powder is a natural mineral grinding powder, wherein theanti-rust powder is aluminum distearate, wherein the anti-wear powder ismicrocrystalline wax or complex sodium-calcium soap grease, wherein theanti-static powder is glycerol monostearate, and wherein theanti-oxidation powder is butylated hydroxytoluene.
 5. The grindingcomposition according to claim 4, wherein the natural mineral grindingpowder is a natural diamond grinding powder or a natural micron quartzgrinding powder.
 6. A grinding sheet for sharpening shredder blades,comprising: a sheet made of the grinding composition according to claim1, which has been stirred, melted and mixed, and cooled and pressed intosheet form, wherein the viscous grease agent includes stearin candle sothat the sheet is a solid wax sheet.
 7. A grinding product forsharpening shredder blades, comprising the grinding sheet according toclaim
 6. 8. A method of sharpening blades of a paper shredder includingshredder blades, comprising: providing the grinding product according toclaim 7; and shredding the grinding product in the paper shredder sothat the shredder blades are sharpened by the grinding composition asthe grinding product is shredded.
 9. A grinding product for sharpeningshredder blades, comprising: a bag that may be unsealed or sealed; andthe grinding sheet according to claim 6 positioned inside the bag. 10.The grinding product according to claim 9, wherein the bag is made ofplastic and is a plastic bag.
 11. The grinding product according toclaim 10, wherein the plastic is polypropylene.
 12. A method ofsharpening blades of a paper shredder including shredder blades,comprising: providing a grinding product according to claim 9; andshredding the grinding product in the paper shredder so that theshredder blades are sharpened by the grinding composition as thegrinding product is shredded.
 13. A grinding product for sharpeningshredder blades, comprising: a sealed bag; and the grinding compositionaccording to claim 1 positioned inside the sealed bag.
 14. The grindingproduct according to claim 13, wherein the sealed bag is made of plasticand the sealed bag is a sealed plastic bag.
 15. The grinding productaccording to claim 14, wherein the plastic is polypropylene.
 16. Aprocess for manufacturing the grinding product according to claim 13,comprising the steps of: moving and placing a roll of laminated plasticfilm on an automatic form-fill-seal packaging machine; sending ameasured amount of the grinding composition into a feed chute of theautomatic form-fill-seal packaging machine, the measured amount of thegrinding composition being determined by a fill amount of the grindingcomposition needed in view of dimensions of the plastic sealed bagincluding length and width thereof; filling the measured amount of thegrinding composition through the automatic form-fill-seal packagingmachine to provide a filled plastic bag; and sealing the filled plasticbag to provide the grinding product.
 17. The process according to claim16, wherein the plastic film is made of polypropylene and is apolypropylene plastic film.
 18. The process according to claim 16,further comprising the step of pre-printing on the plastic film at leastone of (a) overprinted text that is monochromatic or multicoloroverprinted text and (b) pictures.
 19. A method of sharpening blades ofa paper shredder including shredder blades, comprising: providing agrinding product according to claim 13; and shredding the grindingproduct in the paper shredder so that the shredder blades are sharpenedby the grinding composition as the grinding product is shredded.